Thermocouple data acquisition system

ABSTRACT

An internal combustion engine analysis system is provided, the system having: a spark plug having a thermocouple sensor coupled thereto, the thermocouple sensor being configured to generate a first signal according to a combustion temperature proximate to the spark plug; a current sensor configured to monitor electrical current provided to the spark plug and generate a second signal based upon current the monitored electrical current; one or more signal conditioners configured to generate a first and a second optical signals based upon the first and second signal respectively; a receiver electrically connected to the one or more signal conditioners, the receiver being configured to generate a first and a second digital signal based upon the first and second optical signals respectively; and an analysis device in signal communication with the receiver, the analysis device configured to receive the first and second digital signal and being configured to generate a visual display of the combustion temperature as it relates to an engine speed of the engine at a first time in response to the receipt of the first and second digital signal.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 12/473,696 filed May 28, 2009, now U.S. Pat. No.8,006,545, which also claims the benefit of U.S. Provisional PatentApplication Ser. No. 61/056,708, filed on May 28, 2008, the contentseach of which are incorporated herein by reference thereto.

FIELD OF THE INVENTION

Exemplary embodiments of the present invention relate to methods andsystems for gathering and analyzing data pertaining to the operation ofan engine. In one particular exemplary embodiment, the data obtainedfrom the engine relates to combustion chamber temperature and rotationalspeed of the combustion engine, wherein the data is collected andprovided to a user in a real-time basis (e.g., during operation of theengine).

BACKGROUND

Engine performance is an important factor for ascertaining fuelefficiency and emission production of an internal combustion engine. Ofthe many ways for determining engine performance, one method is bydetermining the temperatures of a combustion chamber during operation.By determining the combustion temperature and amount of fuel injected tothe combustion chamber, it is possible to determine how efficiently thefuel within the combustion chamber is being burned.

Past attempts to determine these temperatures have utilized thermocoupletemperature sensors located within the combustion chambers. However,prior methods have not been entirely accurate. For example, surroundingcomponents of the internal combustion engine often cause interferencewith temperature signals of the combustion chamber. Also, thetemperature of the combustion chambers are not correlated to otheroperational conditions of the engine, such as fuel injection rate,engine speed or otherwise. Still further, other variances in the enginesystem and detection system often fail to provide for calibration of thesensing system such as specific location of temperature sensors orotherwise.

SUMMARY OF THE INVENTION

Exemplary embodiments of the present invention relate to methods anddevices for gathering an analyzing data related to the operation of anengine. In one particular exemplary embodiment, an internal combustionengine analysis system is provided, the system having: a spark plughaving a thermocouple sensor coupled thereto, the thermocouple sensorbeing configured to generate a first signal according to a combustiontemperature proximate to the spark plug; a current sensor configured tomonitor electrical current provided to the spark plug and generate asecond signal based upon current the monitored electrical current; oneor more signal conditioners configured to generate a first and a secondoptical signals based upon the first and second signal respectively; areceiver electrically connected to the one or more signal conditioners,the receiver being configured to generate a first and a second digitalsignal based upon the first and second optical signals respectively; andan analysis device in signal communication with the receiver, theanalysis device configured to receive the first and second digitalsignal and being configured to generate a visual display of thecombustion temperature as it relates to an engine speed of the engine ata first time in response to the receipt of the first and second digitalsignal.

The above features and advantages and other features and advantages ofthe present invention are readily apparent from the following detaileddescription of the best modes for carrying out the invention when takenin connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects, features, advantages and details appear, by way ofexample only, in the following detailed description of embodiments, thedetailed description referring to the drawings in which:

FIG. 1 illustrates a schematic view of a thermocouple data acquisitionsystem according to an exemplary embodiment of the present invention;

FIG. 2 illustrates components of a thermocouple data acquisition systemaccording to an exemplary embodiment of the present invention;

FIG. 3 illustrates a cross-sectional view of a thermocouple spark plugaccording to an exemplary embodiment of the present invention accordingto an exemplary embodiment of the present invention;

FIG. 4 illustrates an enlarged portion of the thermocouple spark plugshown in FIG. 3 according to an exemplary embodiment of the presentinvention;

FIG. 5 illustrates an alternate configuration of the enlarged portionshown in FIG. 4 according to an exemplary embodiment of the presentinvention;

FIG. 6 illustrates an end view of an optical signal receiver accordingto an exemplary embodiment of the present invention according to anexemplary embodiment of the present invention;

FIG. 7 illustrates another end view of an optical signal receiveraccording to an exemplary embodiment of the present invention;

FIG. 8 illustrates a visual output of an analysis device according to anexemplary embodiment of the present invention; and

FIG. 9 illustrates a visual output of an analysis device according to anexemplary embodiment of the present invention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Exemplary embodiments of the present invention relate to methods andsystems for gathering and analyzing data related to the operation of anengine. Through the features in exemplary embodiments of the presentinvention, it is possible to more accurately analyze the combustionprocess of one or more cylinders of an internal combustion engine. Inone exemplary embodiment this is achieved through the reduction ofsignal interference of a thermocouple signal. In another exemplaryembodiment this is also achieved through the correlation of engine speedwith the thermocouple input. Through the features of exemplaryembodiments of the present invention, real-time analysis of a combustionprocess of an engine is possible. For example, it is possible to providereal-time display (e.g., graphical, tabular or otherwise) of operatingconditions of the combustion chambers, average operating conditions,averaged buffered or corrected data relating to the operating conditionsof the combustion chamber or otherwise.

As used herein, the term module refers to an application specificintegrated circuit (ASIC), an electronic circuit, a processor (shared,dedicated, or group) and memory that executes one or more software orfirmware programs, a combinational logic circuit, and/or other suitablecomponents that provide the described functionality.

In general, referring to an exemplary embodiment shown in FIGS. 1 and 2,a real-time analysis system 10 is provided. The system includes one ormore thermocouple spark plug systems 12 mounted in thermal communicationwith a combustion chamber 14 of an engine 16 shown in part. Inaccordance with one exemplary embodiment, the thermocouple spark plugsystems 12 include a thermocouple sensor 18 located on a spark plug 20and are configured to measure the temperatures within the combustionchambers. The thermocouple spark plug systems 12 are further configuredto generate a signal based upon temperatures within the combustionchambers and more particularly during combustion in accordance with oneembodiment. The temperature measured within the combustion chamberprovides indication of the temperature of the spark plug, which is beingoperated within the combustion chamber.

The system 10 also includes a current sensor 22 configured to detect theelectrical current flowing to the spark plug 20 and is configured togenerate a signal proportional to the detected current flowing to thespark plug 20. This generated signal can be used to derive an operatingspeed (i.e., revolutions per minute (RPM)) of the engine 16. The signalsgenerated by the thermocouple sensors 18 are received by signalconditioners 24 a. The signal generated by the current sensor 22 isreceived by signal conditioner 24 b. The signal conditioners 24 a, 24 bcan generate optical signals based upon the signals received from thethermocouple sensors and the current sensor respectively.

The system 10 further includes a thermocouple data acquisition system(TDAS) or an optical signal receiver 26 configured to receive theoptical signals generated by the signal conditioners 24 a, 24 b andfurther configured to generate one or more digital signals and/or one ormore analog signals based upon the optical signals. The optical signalreceiver 26 comprises a combination of hardware and/or software/firmwarewith a computer program that, when loaded and executed, permits thedevice to operate such that it carries out the methods described herein.

The optical signal receiver 26 is in communication with an analysisdevice or a graphical computational device 28, such as a computer orother processing and display unit, and an analog device 30 or otherwisefor providing information pertaining to combustion within the combustionchamber. In one exemplary embodiment, temperatures within the combustionchambers can be viewed on a real-time basis (e.g., with little to noappreciable time gap between temperature sensing and visual display) incombination with other operating conditions of the engine such as enginespeed, fuel/air flow rate into the engine, power load or otherwise. Thetemperatures measured within the combustion chambers can form anindication of whether or not the heat range of the spark plug, in whichthe thermocouple sensor is located on, is properly matched to theengine. If the temperature of the spark plug is too cold, carbondeposits will accumulate and eventually foul the spark plug. If thetemperature of the spark plug is too hot, the fuel charge will beignited prior to normal spark ignition resulting in what is known as“preignition”.

In one exemplary operation, the thermocouple sensors 18 are located onthe spark plugs being operated within the combustion chambers 14 of theengine 16. The thermocouple sensors each generate a signal based uponthe temperatures within the combustion chambers, particularly duringcombustion therein. These signals travel to the signal conditioners 24where they are converted to optical signals and further transmitted tothe optical signal receiver 26. The optical signal receiver 26 generatesdigital signals based upon the optical signals and transmits the digitalsignals to the graphical computational device 28. Optionally or inaddition, the optical signal receiver 26 generates analog signals basedupon the optical signals and transmits the analog signals to an analogdevice 30. The graphical computational device 28 provides a real-timedisplay of the temperatures of the combustion chambers and indicates thespeed of the in response to the receipt of the digital signals.

In accordance with one embodiment, the optical signal receiver 26 isconfigured to modify or correct the thermocouple data (e.g.,temperatures within the combustion chamber) with a correction factorthat is based upon the configuration of the engine and/or analysissystem, such as, for example, the specific location of the thermocouplesensor within the combustion chamber, components of the engine and/oranalysis system (e.g., type of spark plug), or otherwise. In oneembodiment, the optical signal receiver 26 can receive the correctionfactor from the graphical computational device 28 and correct thethermocouple data of the digital signals and/or analog signals prior totransmitting the same to the graphical computational device. As such,the digital signals and the analog signals transmitted to the graphicalcomputational device 28 and the analog device 30 respectively caninclude the corrected thermocouple data. In an alternate embodiment, thegraphical computational device 28 modifies or corrects the thermocoupledata of the digital and/or analog signals with the correction factor. Inthis embodiment, the corrected thermocouple data can then be sent to theoptical signal receiver 26 for transmission to the analog device 30.

In greater detail, with reference to the exemplary embodiments shown inFIGS. 2 and 3, the real-time analysis system 10 includes one or morethermocouple spark plug systems 12. The thermocouple spark plug systemsare in thermal communication with one or more combustion chambers 14 ofthe engine 16. In one configuration, the thermocouple spark plug systemis provided for each of the combustion chambers (e.g., cylinder) of theengine. The thermocouple spark plug system 12 generally includes anouter shell 32 configured to house one or more components of thethermocouple spark plug system. The outer shell also includes a threadedportion 33 for mounting the system to the engine. The thermocouple sparkplug system further includes a center electrode 34 and ground electrode36 for generation of a spark suitable for igniting an air/fuel mixturewithin the combustion chamber. The center electrode is insulated fromthe outer shell and ground electrode through insulator 38. The centerelectrode is connected to a power source 39 through spark wire 40. Thepower source 39 can be a distributor, coil pack, coil on plug or anyother device in accordance with one exemplary embodiment. Of course,other power generating or transmitting devices can be used in otherexemplary embodiments and should not be limited to the example describedherein. This connection may be further improved upon through a suitableconnector 42.

Referring to FIG. 3, the thermocouple spark plug system further includesthermocouple sensor 18 located on the spark plug operating within thecombustion chamber. In one exemplary embodiment, the thermocouple sensoris disposed along insulator 38 and is spaced from the center and groundelectrodes as shown in FIG. 4, which is an exploded view of a portion ofthe thermocouple spark plug shown in FIG. 3. In another exemplaryembodiment, with reference to FIG. 5, the thermocouple sensor 18 isdisposed on or along the center electrode. The thermocouple sensor is incommunication with the signal conditioner 24 a through signal wire 44.The thermocouple sensor 18 operates by generating electrical currentbased upon the temperature within the combustion chamber. For example,as the temperature within the combustion chamber increases a thermalgradient is formed across the thermocouple sensor resulting in theformation of potential energy (e.g., voltage) and a current. Thiscurrent travels as a signal to the signal conditioner 24 a where it isconverted or modified to an optical signal.

The real-time analysis system 10 also includes current sensor 22configured to monitor current to the spark plug 20. By monitoringcurrent to the spark plug, and hence ignition within a combustionchamber, it is possible to ascertain the number combustions within acombustion chamber per minute, which further provides indication of thenumber of revolutions the engine undergoes per minute. In other words,the monitoring of current to the spark plug 20 provides indication ofengine speed. In accordance with one exemplary embodiment, the opticalsignal receiver 26 determines or derives the engine speed (e.g., numberof revolutions the engine undergoes per minute) based upon the opticalsignal from the signal conditioner 24 b through one or a combination ofpredetermined algorithms, lookup tables or otherwise. The monitoring ofcurrent may be performed anywhere at or between the power source (e.g.,ignition power supply, battery, alternator or otherwise) and the sparkplug. For example, the monitoring may be based upon current transmittedfrom a coil, battery, alternator or other power generating ortransmitting device to the spark plug. Once current has been detected,the current sensor generates and transmits a signal to the signalconditioner 24 b.

In exemplary embodiments, referring to FIGS. 1 and 2, the monitoring ofelectrical current to the spark plug is achieved along the spark plugwire 40. In one configuration, the current sensor includes a clamp 46configured for bringing opposing members 48 together adjacent the wire,wherein one or both of the opposing members are configured to measurecurrent traveling to the spark plug 20. The current sensor is furtherconfigured to generate signals to the signal conditioner 24 b based uponsensed current along the spark plug wire. In one exemplary embodiment,the current sensor transmits a signal every time current travels alongthe spark plug wire indicating the generation of spark with the sparkplug. This signal is transmitted to the signal conditioner 24 b througha signal wire 45.

The signals generated by the thermocouple sensor and the current sensorare received by one or more signal conditioners for converting thesignals received into optical signals. The conversion of these signalsto optical signals reduces the potential of electrical interferencecaused by surrounding components of the engine as can be appreciated bythe skilled artisan. As the signal conditioners are contemplated asbeing located proximate to the thermocouple sensor and current sensor,it is contemplated that the signal conditioners are configured towithstand substantial amounts of heat emanating from the engine.

In one exemplary embodiment, a single signal conditioner is provided forboth the thermocouple sensor and the current sensor. In anotherexemplary embodiment, a signal conditioner is provided for each of thethermocouple sensor and current sensor. Still further, a signalconditioner may be provided for each of the thermocouple sensors (i.e.,one or more per cylinder of the engine or otherwise) in accordance withone exemplary embodiment. In any embodiment, the signal conditionerreceives the signals from the thermocouple sensor(s) and currentsensor(s) and converts the signals to optical signals to be received bythe optical signal receiver 26 for further processing. Accordingly, thesignal conditioners are in communication with the optical signalreceiver through one or more optical cables 49, such as fiber optic wireor cable or otherwise.

The optical signals may be generated in any suitable configuration. Forexample, the signals from the thermocouple sensor and current sensor maybe pulse modulated, width modulated or both. In one exemplaryembodiment, the signal conditioner converts the signals to a pulsemodulated optical signal. Also, the signal conditioner may be configuredfor calibration.

In accordance with one exemplary embodiment, the optical signal receiver26 receives optical signals generated by the signal conditioners. In oneexemplary embodiment an optical signal receiver is provided for eachcylinder bank (e.g., 2 or more) of an engine. It is also contemplatedthat an optical signal receiver may be provided for each cylinder orthermocouple sensor. Other configurations are contemplated and shouldnot be limited to any configuration described herein.

The optical signal receiver 26 converts the optical signals to digitalsignals and/or analog signals for transmission to a computational devicesuch as graphical computational device, analog device or otherwise. Thisconversion of optical signals to digital signals and/or analog signalsmay be achieved through module, devices and configurations known in theart. For example, the optical signal receiver may include one or moresignal converting modules for converting the optical signals to digitalsignals and/or analog signals to be received by the graphicalcomputational device 28 and/or analog device 30.

In accordance with one exemplary embodiment, the optical signal receiver26 includes a plurality of thermocouple channels or thermocouple inputports 50 for receiving signals collected from the one or morethermocouple sensors 18 via the one or more signal conditioners. Theoptical signal receiver further includes at least one current channel orcurrent input port 52 for receiving signals collected from the currentsensor 22 via one or more signal conditioners. In accordance with oneexemplary embodiment, the thermocouple channels are in communicationwith one or more signal converting modules located within the opticalsignal receiver, which are in further communication with one or moreoutput channels and connectors. Accordingly, each channel may bedirected towards a signal converting module where the signals areconverted and then travel along another channel to exit the opticalsignal receiver 26.

The optical signal receiver can be powered by a suitable power supply60. In one exemplary embodiment, referring to FIGS. 6 and 7, the opticalsignal receiver 26 further includes an alternating current powerconnector 62, a direct current power connector 64 and a power indicator66. Accordingly, it is contemplated that the optical signal receiver isconfigured for being power through a suitable alternating currentsource, such as a 110V source, 220V source or otherwise. Similarly, theoptical signal receiver may be configured for being power through asuitable direct current source, such as 12V or 24V vehicle battery orotherwise. The optical signal receiver further includes a digitalconnector 68 and an analog connector 70 for the transmission of signalsto other devices, such as the graphical computational device, analogsignal converter, analog device or otherwise.

The optical signal receiver also includes a plurality of thermocoupleinput connectors 80 configured for placing the plurality of opticalwires in communication with the plurality of thermocouple channels 50within the optical signal receiver. It is contemplated that the numberof connectors may be equal to the number of channels. It is furthercontemplated that the optical signal receiver includes a number ofthermocouple channels and thermocouple input connectors as combustionchambers or cylinders of an engine, number of spark plugs of an engineor otherwise. Accordingly, the optical signal receiver may include 4, 6,8, 12, 16, 24 or more thermocouple channels and thermocouple inputconnectors. The thermocouple input connectors may comprise any suitableoptical wire connector. The optical signal receiver further includes acurrent input connector 82 configured for placing the optical wireassociated with the current sensor in communication with the currentchannel 52 of the optical signal receiver. The thermocouple inputconnectors and current input connector are in communication with thedigital connector 68, the analog connector 70 or both for providingtransmission of the optical signals, in digital form, to the graphicalcomputational device, in analog form to the analog converting device, orboth.

In one exemplary embodiment, the digital signals generated from the oneor more optical signal receivers are transmitted to a graphicalcomputational device for analysis and display. Accordingly, thegraphical computational device includes a suitable connector forreceiving signals from the optical signal receiver, via the digitalconnector 68. Corresponding connectors and conduits may comprise anysuitable connector/conduit configuration such as serial port connection,parallel port connection, USB connection or otherwise. In one exemplaryembodiment, the graphical computational device comprises a computer suchas a lap top, desk top or otherwise. The graphical computational deviceincludes a combination of hardware and/or software/firmware with acomputer program that, when loaded and executed, permits the device tooperate such that it carries out the methods described herein, such asproviding graphical representations of data received from the one ormore optical signal receiver. The graphical representations may be inthe form of tabular displays, charts, graphs or otherwise fordemonstrating combustion chamber/spark plug temperature and engine speedas they relate to each other and as they relate to time while the engineis operating. In one embodiment, the graphical computational device isconfigured to generate a graphical display demonstrating a movingaverage of the combustion chamber temperature and engine speed as theyrelate to each other and as they relate to time while the engine isoperating.

For example, referring to FIG. 8, an exemplary visual display 80 isshown. The visual display includes a plurality of temperature columns83, each representing a channel in communication with a thermocouplesensor located within a combustion chamber. The visual display alsoincludes a revolution per minute (RPM) indicator 84 demonstrating enginespeed. The visual display further includes a counter 86 providingindication of running time of the real-time analysis system. In anotherexample, referring to FIG. 9, another exemplary visual display 90 isshown. This visual display comprises a graph 92 having a plurality ofthermocouple sensor indicators 94 and an RPM indicators 96, wherein eachindicator includes a different visual indicia, such as color, lineweight, line continuity or otherwise. The graph 92 displays thetemperature and engine speed over a predetermined period time in whichthe real-time analysis system is running. In this example, thermocoupledata and RPM data are taken over a five-minute period of time. It shouldbe appreciated that other information of the real-time engine analysissystem 10 may also be displayed, such as average temperature of eachcombustion chamber cylinder, each bank of cylinders or all of thecombustion chambers. Also, other types of visual displays are alsocontemplated, such as other charts, graphs or otherwise. In oneexemplary embodiment, the optical signal receiver or the graphicalcomputational device averages the thermocouple data and the RPM datacollected from the thermocouple sensors and the current sensorrespectively and stores the same in a buffer for future analysis inaccordance with one embodiment.

In one exemplary embodiment, the optical signal receiver 26 isconfigured to modify or correct data relating to the thermocouplesensor, current sensor or both. For example, in one configuration, theoptical signal receiver 26 is configured to correct for specificlocation of the thermocouple sensor within the combustion chamber by apredetermined correction factor. The predetermined correction factor maybe a linear correction equation, multiplier or otherwise made to thedata/temperature signal received by the optical signal receiver 26 tobring the sensed temperature of the combustion chamber to what isanticipated or expected.

For example, in one configuration generation of a correction factorcomprises placing a thermocouple sensor within a combustion chamber andigniting air/fuel within the combustion chamber to elevate thetemperature within the combustion chamber to a known temperature. Thecorrection factor is ascertained by determining the linear temperaturechange needed to modify the sensed temperature to the actual oranticipated temperature. The method may be used for different spark plugthermocouple configurations. It should be appreciated that other methodsare available for correcting the sensed temperature.

In one exemplary embodiment, the graphical computational devicegenerates the graphical display through one or more softwareinterfaces/applications/modules installed therein. For example, thegraphical computational device may include a LabVIEW™ based softwareinterface serially connected to the optical signal receiver 26 forgenerating graphical displays as described above.

In another exemplary embodiment, the analog signals generated by theoptical signal receiver may also be transferred to the analog device 30,which can be any customer analog recording device for logging data inaccordance with one exemplary embodiment. This is particularlyadvantageous for incorporating the real-time analysis system to prioranalog systems used for displaying information relating to temperatureof a combustion chamber or otherwise. In particular, the signal may beparticularly adjusted to specific analog devices including strip charts,recorders or otherwise, of various markets or companies. For example,the signal may be adjusted to include a signal voltage for a specificanalog device. It is contemplated that the voltage can be adjustedbetween 0 to 10 volts, though other ranges are possible.

The digital signals generated by the optical signal receiver may bestored by the optical signal receiver, graphical computational device,analog device, removable storage device (e.g., flash member, hard drive)or otherwise. It is contemplated that the data may be generated and/orstored for any suitable time period. For example, the data may becontinuously generated and/or stored for 2 minutes, 5 minutes, 10minutes or otherwise.

Referring to the drawings, exemplary systems and methods for real-timeanalysis of an operating engine are shown. In one exemplary embodiment,a thermocouple sensor 18 is placed within a combustion chamber 14 of anengine 16. The thermocouple sensor is disposed on an end of a spark plug20 configured for generation of a spark within the combustion chambersuitable to cause ignition of an air/fuel mixture therein. Duringcombustion within the combustion chamber, the thermocouple sensorgenerates a signal that is received by the signal conditioner 24 a andis indicative of the temperature within the combustion chamber. Thesignal conditioner 24 a converts the generated signal to an opticalsignal and transmits the optical signal to the optical signal receiver26 where a digital signal and/or an analog signal is generated basedupon the optical signal. In accordance with one embodiment, the opticalsignal receiver 26 corrects the thermocouple data of the digital signaland/or analog signal with a predetermined correction factor beforetransmitting the signals to the graphical computational device and/oranalog device.

As such, the digital signal and/or analog signal include correctedthermocouple data. Simultaneously, a current sensor 22 is placedproximate to an electrical power connection to the spark plug. Thecurrent sensor detects the electrical current to the spark plug andgenerates a signal, which is received by the signal conditioner 24 b andconverted to an optical signal. The optical signal is transmitted to theoptical signal receiver 26 where a digital signal and/or analog signalare generated based upon the optical signal. The generated digitalsignal and analog signal based upon the thermocouple sensor and currentsensor are further transmitted to the graphical computational device 28and the analog device 30 respectively for further processing. The datafrom the digital signals are graphically displayed to provide real-timeobservance of the temperature of one or more combustion chambers androtational speed of the engine as they relate to time and to oneanother. Other modifications of the data may be further made. Thegraphical computational device may provide a moving average of thethermocouple data of the digital signals and display such data inreal-time in a similar fashion as described above.

While the invention has been described with reference to exemplaryembodiments, it will be understood by those skilled in the art thatvarious changes may be made and equivalents may be substituted forelements thereof without departing from the scope of the invention. Inaddition, many modifications may be made to adapt a particular situationor material to the teachings of the invention without departing from theessential scope thereof. Therefore, it is intended that the inventionnot be limited to the particular embodiments disclosed as the best modecontemplated for carrying out this invention, but that the inventionwill include all embodiments falling within the scope of the presentapplication.

1. An internal combustion engine analysis system, comprising: a sparkplug having a thermocouple sensor coupled thereto, the thermocouplesensor being configured to generate a first signal according to acombustion temperature proximate to the spark plug; a current sensorconfigured to monitor electrical current provided to the spark plug andgenerate a second signal based upon current the monitored electricalcurrent; one or more signal conditioners configured to generate a firstand a second optical signals based upon the first and second signalrespectively; a receiver electrically connected to the one or moresignal conditioners, the receiver being configured to generate a firstand a second digital signal based upon the first and second opticalsignals respectively; and an analysis device in signal communicationwith the receiver, the analysis device configured to receive the firstand second digital signal and being configured to generate a visualdisplay of the combustion temperature as it relates to an engine speedof the engine at a first time in response to the receipt of the firstand second digital signal.
 2. The system as in claim 1, wherein the oneor signal conditioners are each in signal communication with thereceiver through a fiber optic cable.
 3. The system as in claim 1,wherein the receiver is further configured to generate a first andsecond analog signal based upon the first and second optical signalrespectively.
 4. The system as in claim 3, wherein the receiver includesa first connector and a second connector, the first and second digitalsignals are transmitted to the analysis device through the firstconnector and the first and second analog signals are transmitted to ananalog device through the second connector.
 5. The system as in claim 1,wherein the receiver is further configured to correct the combustiontemperature of the first digital signal with a predetermined correctionfactor that is based upon an expected combustion temperature, theanalysis device is configured to display the corrected combustiontemperature as it relates with the engine speed at the first timethrough the visual display.